Segment Information (Schedule Of Segment Reporting - Net Sales) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 26, 2020	Jan. 31, 2021	Jan. 26, 2020
Segment Reporting Information [Line Items]
Net sales	$ 2,279	$ 2,162	$ 4,619	$ 4,345
Meals & Beverages [Member]
Segment Reporting Information [Line Items]
Net sales	1,300	1,224	2,642	2,418
Snacks [Member]
Segment Reporting Information [Line Items]
Net sales	$ 979	$ 938	$ 1,977	$ 1,927